Inductor-alternator.



' PATBNTED SEPT 18, 1906.

. G. A. KELSBY.

INDUGTOR ALTERNATOR.

APPLICATION FILED JULY 6, 1905.

2 SHEEIS-SHEET 1- m W @flwgg Atty No. 831,442. PATENTED SEPT. 18, 1906.G. A. KELSEY.

INDUOTOR ALTERNATOR.

APPLICATION FILED JULY 6, 1905.

$3M 1 M 16M! Atty UNITED STATES P 'rENT OFFICE.

CHARLES OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEY'G. 1.:ELECTRIC MANUFACTURING COMPANY, A COR-PO-" .RATION OF NEWV'JERSEY.

s moucfon- LTERNAToR.

Specification of Lettei Patent.

Patented Sept. 18, 1906.

I0 aZZ wiwnp it may concern.-

Be it known that 1, CHARLES A. KELsEY, a citizen of the United States,residing at Pittsfield, county of Berkshire, State of Massachusetts,have invented certain new and use-' ful Improvements inInductor-Alternators, of which the following is a specification.

My invention relates to alternating-current generators of the inductortype, and is particularly applicable to high-speed inductor-alternatorsfor comparatively low frequency.

Induetor-alternators are in many respects particularlyadapted for usewith prime movers operating at a very high speed, such assteam-turbines, since no sliding contact and no moving wire whatever isrequired, and consequently the structure of the rotating-inductonnmyreadily be designed for great mechanical strength adapted to resist.

high centrifugal strain. As inductor-alternatorslha-ve been constructedheretofore it has been necessary to employ at least two poles on theinductor in order to secure a mechanical balance, and asinductor-alternators are ordinarily arranged one rpvolution of theinductor produces as many complete cycles as there are poles-that'is, atwo-pole inductor produces two complete cycles per revolution. Thus analternator designed for twenty-five cycles would have a speed of sevenhundredand fiftv revolutions per minute. which; particularly with smallmachines, is too low for most efficient operation of a steam-turbine,while for still lower frequencies a still more inefficient speed isrequired.

The object of'my invention is to provide a novel form ofinductor-alternator adapted to give only one cycle for each complete16V'0lLltion, and thereby to double the speed at which the generator maybe operated for any desired frequency.

My invention broadlyjconsists jinnrranging the inductor with a singlehelical polar projection. Since only one polar projection employed, then'iac'hi'nc gives only one cycle for each revolutionfand sincetheprojection is arranged inja helix tire inductor may be mechanically balaed,

My invention further 9 hi'pri'ses a number of structural features, whichwill be best understood by reference to the accompanying drawings, inwhich Figure 1 shows an end elevation of aninductor alternator arrangedin accordance with-my invention. Fig. 2 shows a side-elevation withone-half of the stationary frame removed. -Fig.,3 showsadetail of one ofthe inductor punchings or laminations, and Fig. 4 shows a detail of theinductor-shaft.

In the drawings, A- represents the frame of' the machine, which isprovided with two proeldstructure.

jfcting poles B, like an ordinary bipolar On the poles B 'are mountedthe field-coils C, which furnishthe magneti-c zation for the machine.Onthe faces of the poles B are supported laminated cores D,

which are held in place by suitable clampingplates E. Tlfe laminatedcores D are arranged with helical slots, as is clearly sho'..n in Fig.2, and in these slots are placedthe armature-coils F Inthis figure thearma ture-coils are arranged to produce a twophase current, each phasecomprisingtwo coils and the-coils of the two phasesubeing displaced fromeach other ninety electrical degrees. Count ng from left to rightin Fig.2, coils l and 3 are at the point of maximum induced voltage, since oneside of these coils is directly opposite the center of the .polarprojection on the inductor. Coils 2 and 4 are at the oint ofzero-induced voltage,- since the po ar projection is directly oppositethe centers of thesecoils.

G represents the 'indulrtoi' -shaft, which is mounted in suitablehearings not shown) between the field-poles. Sirrrounding the shaft andsupported thereby are a'number of punchings or laminations H, arranged1n planes perpendicular to the axis of the shaft These laminations areshaped, as shown in Fig. 3, like rings or disks of unequal depth onopposite sides. Each lamination thus has one part projecting beyond the'rest of the punching, and the several unchlngs are so arranged on theinductor-s aft that each-1s displaced circumferentially a small amountIn thls manner a. lammfrom the next one; i ated mass is produced havinga slngle helical polar projection. As shown mFig. 2, this polarprojection makes two completeturns around the inductor. v

In order to secure the'helical arrangement of the punchings, the shaft Gmay be provided with a s iral groove, as shown n Fig. 4, and thepunchings provided with slmllarly inductor neither circumferential noraxial, 'butrin a 'direction rmdway between these two, it may:

' positioned'tongues h, as shown in Fig. 3., ada ted to engagetheihelical oove in the she. t.f Thepunchin s are hel in place -on 1 theshaft by suitab e clamping-rings I at eachend. Since the relativemovement of the helical 1e and of the armature-slots 'is iobe-desirabl'e to laminate the peri hery' of the done in asimple mannerby-slotting'the pej riphery of the projection offeach punching,

- asshownathin Fig.3.1a. 15" The machine as abovedescribed evidentlygives one cycle PGI'IOVOlIltiOIl, so that by my invention it is possibleto operate an inductor -alternator or twenty-five cycles at fife:-

' teen hundred revolutions per mmute or.-.for' sixty cycles atthirty-six hundred revolutiona. r 'j' I do not desireto limit myself tothe par ticular construction and arrangement of parts here shown, butaim ii the a'pended claims to cover all modifications w ch are withinthe scope of my invention. What I claim as new, and desire to, secure byLetters Patentof the; United States, is.' 1. In a dynamo-electricmachine, 'a re? volving inductor having a helical polar prosaidinductor, and helically arraiiged station. ary .armatureecoils.

.jectionQa field winding adapted ,jto magnetizef tion, so as to form alaminated mass having a helical polar projection. n

. f4. In,a-'dynamo-electricmachine, an inductor comprising a revolvingshaft, and lamina-tio'ns surrounding and supported by the shaft; eachlamination being of ,unequal depth on op'posit'e sides and displacedcircumferentia laminationso as to form laminat'ed .nass havin ahelicalpolariprojection;

ductor comprising a evamp 1 sha with a helicalgrooveaii'd akp uiay ofsimi-'" -a revolving inductor between said poles having a helical polarprojection, and armature of said poles.- I g 8. In a dynamo-electricmachine, a bipolar field structure, field-coils carried on the poleslaminated cores carried on thqpole faces an field structure, field-coilsh laminated cores carried "on 'the pole-faces'and 2. Ina.dynaino-electric machine, a statiallya; small amount from the nextlaminationa y a small amount from the next hand thisBd day "of July,1905.- 1

. 5. ii a, dynainofelectlj lcamachine, anini' ft? provided I larring-shaped laminations surrounding said shaft, each lamination being ofunequal 6o depth on'opposite sides and provided with a tongue adapted toengage said groove.

6. In a dynamo-electric machine, a bipol'ar field structure, field-coilscarried on the poles, 1

0011s carried on the faces of said poles in in- I .di ctive relation tosaid inducto'r. inductor-punchings' axially. ,T us ;m ay be fieldstructure, field-coils carried on the poles,

'ing a helical polar pro'ection, 'and'helicallyarranged armature-coi scarried on the faces arranged with helic'al. slots,' .'ariiiature-coilscarried in said slots and a revolving inductor between-said 'poleshaving a helical lav pro 8e jection. r

9. In adynamo-electri "achine, abipolar I ed on the poles,

arranged with helical slots, armature-coils .ca'rried in said slots, arevolving shaft between said poles,v and laminat ons SllIIOlHld',

ing andsupported by said shaft, each lamination being'of unequal de 'thon o posite sides and dis laced circumferential a small 0 amount om thenext lamina tion so *asto form alaminated mass having a helical polarprojection. v v

10. In a dynamo=elect iemachine, a revolving inductor built up ofparallel lamina-"r 5 'tions arranged in-planes ei'pend'i cular to theshaft, each laminationa-ving' af-projecting ortion slotted atititsperiphery and being displaced circumferentially asmall amount from .the'next lamination,"'so as to, form a mo laminated mass having 'ahelicalpolar 'projection.

11. In-a dynamo-electric machine, a staframe, a field-winding carriedthereby, a aminated core carriedby saidjfi-ame and arranged with helicalslots, armature coils carried in said slots, and a revolvinglaminated-inductor havinga helical polar projection, each lamination ofsaid inductor eing slotted at'its .peri hery. v In witnesswher'eof I avehereunto set my ,CHARLES-A; KELSE'Y. ew i ssesz. f 3r FREDBIGKMURRAY"PIA'IY, 1 Forums THOMPSON. (luitniinsijfy

